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Vulnerability · Published Aug 17, 2021 · Assigned by mozilla

CVE-2021-29987

Medium 6.5

In plain English

A medium-severity security flaw in Firefox from Mozilla. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.9% (higher than 61% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS NVD)6.5Medium
Exploit odds (30 days)0.9%top 38.7% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known

Official description

After requesting multiple permissions, and closing the first permission panel, subsequent permission panels will be displayed in a different position but still record a click in the default location, making it possible to trick a user into accepting a permission they did not want to. *This bug only affects Firefox on Linux. Other operating systems are unaffected.*. This vulnerability affects Firefox < 91 and Thunderbird < 91.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Alpine:v3.20firefox92.0.1-r0ALPINE-CVE-2021-29987
Alpine:v3.21firefox92.0.1-r0ALPINE-CVE-2021-29987
Alpine:v3.22firefox92.0.1-r0ALPINE-CVE-2021-29987
Alpine:v3.23firefox92.0.1-r0ALPINE-CVE-2021-29987
Alpine:v3.21librewolf92.0.1-r0ALPINE-CVE-2021-29987
Alpine:v3.22librewolf92.0.1-r0ALPINE-CVE-2021-29987
Alpine:v3.23librewolf92.0.1-r0ALPINE-CVE-2021-29987
Alpine:v3.24librewolf92.0.1-r0ALPINE-CVE-2021-29987
Alpine:v3.20thunderbird91.3.2-r0ALPINE-CVE-2021-29987
Alpine:v3.21thunderbird91.3.2-r0ALPINE-CVE-2021-29987
Alpine:v3.22thunderbird91.3.2-r0ALPINE-CVE-2021-29987
Alpine:v3.23thunderbird91.3.2-r0ALPINE-CVE-2021-29987
Ubuntu:22.04:LTSmozjs78no fix listedUBUNTU-CVE-2021-29987

Affected products (as reported)

VendorProductVersions
Mozilla Firefox unspecified – before 91
Mozilla Thunderbird unspecified – before 91

References